mav_SMSCallbackExecFnSet - Set/execute SMS callback function.

[ Maverik Level 3 functions ]

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mav_SMSCallbackExecFnSet

mav_SMSCallbackExecFnSet, mav_SMSCallbackExecFnExec

## Summary

Set/execute SMS callback function.

## Syntax

void mav_SMSCallbackExecFnSet(MAV_SMSClass *sc, MAV_SMSCallbackExecFnFn fn);

int mav_SMSCallbackExecFnExec(MAV_SMS *s, MAV_drawInfo *di, MAV_SMSExecFn *fn);

## Description

mav_SMSCallbackExecFnSet sets a callback function which upon execution uses drawing information `di` to determine for each object in the SMS whether it should be processed further by the function defined in `fn`. Normally this will be a drawing function and the `di` would include the clip planes associated with a given view.

An example of a non-drawing use of `fn` might be to count the number of objects occupying an arbitrary volume of space. Here, `di` would be set to the clip planes defining the volume (and the view information would not be used).

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